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公开(公告)号：US2472942A
公开(公告)日：1949-06-14
申请号：US73546647
申请日：1947-03-18
Applicant: EITEL MCCUILOUGH INC
Inventor： DONALD DRIESCHMAN , RICHARD CHAMBERLIN
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003
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